jquery 1st child code example
Example 1: firstElementChild jquery equivalent
$('#myList > li:first-child');
// or
$('#myList').children('li:first-child');
// or
$('#myList > li').first();
// or
$('#myList').children().first();
// and so on
Example 2: jquery first child
$('div:first-child')
Example 3: jquery first child
$( "li" ).first().css( "background-color", "red" );